cottongin ea11d2f7d3 refactor: Revert letterbox fill to Dithered/Solid/None with edge caching ...

Simplify letterbox fill modes back to Dithered (default), Solid, and
None. Remove the Extend Edges mode and all per-pixel edge replication
code. Restore Bayer ordered dithering for the Dithered fill mode.

Re-introduce edge average caching so cover edge computations persist
across sleep cycles, stored as a small binary file alongside the cover
BMP.

Co-authored-by: Cursor <cursoragent@cursor.com>

2026-02-13 11:12:27 -05:00

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